When making massive inserts it reaches a point where the server rejects new inserts with the following error in the logs:

ERROR: mmap() failed for ...
len: .... errno:12 Cannot allocate memory

We have tested making it in PHP and Python, and the problem is the same in both.

The attachment is a simple script in PHP which causes the error

We have apparently solver it telling the kernel not to limit the memory size of the MongoDB project with the command

sysctl -v unlimited